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If x, y, and z are consecutive integers such that x > y > z [#permalink]

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21 Jul 2013, 07:55

5

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A

B

C

D

E

Difficulty:

65% (hard)

Question Stats:

49% (02:44) correct
51% (01:07) wrong based on 168 sessions

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If x, y, and z are consecutive integers such that x > y > z and the sum of x, y, and z is a multiple of 10, which of the following could be the value of x?

If x, y, and z are consecutive integers such that x > y > z and the sum of x, y, and z is a multiple of 10, which of the following could be the value of x?

Guys I think 2 answers are correct. What do you come up with?

Given that \(z + y +x = (y-1) + y + (y+1) = 3y = 10k\) --> \(y\) is a multiple of 10 --> \(x = y+1\), so x is a multiple of 10 plus 1. Only answer choices B fits: \(z=-1\), \(y=0\), and \(z=1\) --> \(z+y+x=0\).

Answer: B.

Else you could simply plug-in values for x in (x-2) + (x-1) + x and see which one yields a multiple of 10.
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Re: If x, y, and z are consecutive integers such that x > y > z [#permalink]

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15 Dec 2014, 04:01

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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This question can be easily beaten by a bit of "brute force" and TESTing THE ANSWERS.

We're given a very specific set of restrictions in this prompt: 1) X, Y and Z are CONSECUTIVE INTEGERS 2) X > Y > Z 3) X+Y+Z = a multiple of 10

We're asked which of the 5 answer COULD be the value of X given these restrictions. Rather than staring at the screen or doing layered math, we can "brute force" the answers until we find one that fits these restrictions..

Answer A: X = 0 In this case, the numbers would be 0, -1, and -2. The sum = -3 which is NOT a multiple of 10. Eliminate A.

Answer B: X = 1 In this case, the numbers would be 1, 0, and -1. The sum = 0 which IS a multiple of 10. B IS the answer.

For the sake of argument, if you did not immediately realize that 0 is a multiple of 10, then you could quickly TEST the remaining 3 options and quickly disprove them.

Your approach works here, but ONLY because 0 is the multiple of 10 that is involved in the correct answer. If it was any other multiple of 10, then you would have only gotten the solution by "brute forcing" your equation into every possible multiple of 10.

eg.

3x - 3 = 10 3x - 3 = 20 3x - 3 = 30 Etc.

Since these answer choices in this question are all relatively small, even if you did have to brute force multiple possibilities, you would have gotten to the answer relatively quickly, so I think that your approach is fine. In the end, I measure any approach by 2 things:

1) Did it get you the correct answer. 2) Were you able to complete the question relatively quickly (for that prompt).

If the answer to both questions is YES, then you did well.

Re: If x, y, and z are consecutive integers such that x > y > z [#permalink]

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05 Apr 2016, 10:21

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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